PENNELL: STUDIES IN THE AGALINANAE 403 
Also I am indebted to Dr. N. E. Brown of Kew Gardens, 
England, for consulting Bentham’s types in their collections, 
portions of three of which were kindly sent me; to Dr. A. B. Rendle 
of the British Museum for examining Walter's types; and to 
Dr. C. H. Ostenfeld of Copenhagen, Denmark, for comparing the 
type of Gerardia tenuifolia Vahl. 
Of the thirty-four species and subspecies in the following 
pages, all but one have been seen and studied in the field. This 
exception, Agalinis oligophylla, is a Louisiana species not in flower 
in August when I was there. All new species here proposed have 
been seen growing, and compared with allies in their native 
environment. It has been a matter of no small satisfaction that 
herbarium material since reviewed has fallen so readily into the 
species deemed valid in the field. 
A word may be said concerning field variation in this group. 
The one species of Macranthera and our two of Afzelia, as well as 
all our species of Agalinis seem relatively uniform and constant. 
Breaks between species in the last are often slight but field-study 
shows them to be true—I have observed little in this genus to 
suggest hybridism or pronounced subspecific variation. On the 
other hand, in Aureolaria, especially in the subgenus Panctenis, 
conditions seem much more complicated, and such a species as 
Aureolaria pectinata can be viewed only as composed of a number 
of strains. 
In the following treatment the endeavor is made to include 
quite fully diagnostic characters in the key, while, to save space, 
only in the case of new species are specific descriptions given. 
Full synonomy is included so far as Coastal Plain species are’ 
concerned. Type localities are quoted from the original descrip- 
tions, and where types have been examined the fact is noted. No 
types have been found for Rafinesque’s species. The type of 
Gerardia tenuifolia leptophylla Benth.* has not been as yet identi- 
The flowering and fruiting seasons are from specimens seen, — 
but are necessarily incomplete. North and south the flowering 
season is about the same for a given species, possibly a little later 
south. All definiteness in season seems to be lost in southern 
* Hook. Comp. Bot. Mag. 1: 174- 1835. “ Jacksonville, Louisiana.” G. tenui- 
folia filiformis Benth. in DC. Prodr. 10: 518. 1846, is the same plant. 
